Adwa AD12 Manual

Adwa Måling AD12

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Side 1/2

w w w . a d w a i n s t r u m e n t s . c o m

USER MANUAL

AD11 & AD12

Waterproof pH Testers

Dear Customer,

Thank you for choosing an Adwa product.

Please read carefully this manual before

starting operations.

These instruments are in compliance with the

EMC Directive 89/336/EEC and Low Voltage

Directive 73/23/EEC for electrical equipments.

For additional technical information, please

e-mail us at sales@adwainstruments.com.

INTRODUCTION

AD11 and AD12 are waterproof pH and

temperature testers. The housing has been

completely sealed against humidity.

All pH readings are automatically temperature

compensated (ATC), and temperature values

can be displayed in °C or °F units.

The meter can be calibrated at one or two

points for pH with auto-buffer recognition

and against five memorized buffer values.

Measurements are highly accurate with a

unique stability indicator right on the LCD.

The models are also provided with a low

battery symbol which warns the user when

the batteries need to be replaced.

The AD11P pH electrode, supplied with the

meter, is interchangeable and can be easily

replaced by the user.

The encapsulated temperature sensor allows

fast and accurate temperature measurement

and compensation.

Each meter is supplied complete with:

•AD11P pH electrode

• 4 x 1.5V batteries, button type

• User manual

FRONT PANEL & DISPLAY

1. Dual line LCD

2. ON/OFF/ MODE button

3. pH electrode & temperature sensor

4. Electrode body

5. Battery compartment (inside)

6. SET/HOLD button

7. Clip holder

1. Stability indicator (hourglass symbol)

2. Low battery warning indicator

3. Calibration mode / calibrated meter indication

4. ATC (Automatic Temperature Compensation)

indicator

5. Secondary LCD level

6. Primary LCD level

7. Measurement unit for primary level

TECHNICAL DATA

Range -2.0 to 16.0 pH (AD11)

-2.00 to 16.00 pH (AD12)

-5.0 to 60.0 °C / 23.0 to 140.0 °F

Resolution 0.1 / 0.01 pH

0.1 °C / 0.1 °F

Accuracy (@25 °C/77 °F)

±0.1 / ±0.01 pH

±0.5 °C / ±1 °F

pH Calibration

Automatic, 1 or 2 point

with 2 sets of memorized buffers

(pH 4.01/7.01/10.01 or 4.01/6.86/9.18)

pH Electrode AD11P (included)

Temperature Compensation

Automatic

Battery Type 4 x 1.5V button type

Battery Life Approx. 300 h of use

Auto-off After 8 minutes of non-use

Environment

-5 to 50 °C (23 to122 °F); RH 100%

Dimensions 175.5 x 39 x 23 mm

Weight 100 g

AD11P Spare pH electrode

AD70004P pH 4.01 buffer solution, 20 ml, 25 pcs.

AD7004 pH 4.01 buffer solution, 230 ml bottle

AD70007P pH 7.01 buffer solution, 20 ml, 25 pcs.

AD7007 pH 7.01 buffer solution, 230 ml bottle

AD70010P pH 10.01 buffer solution, 20 ml, 25 pcs.

AD7010 pH 10.01 buffer solution, 230 ml bottle

AD7061 Cleaning solution, 230 ml

AD70300 Storage solution, 230 ml

ELECTRODES & SOLUTIONS

ISTAD12 09/14

Turn the meter on

• Press and hold the ON/OFF/MODE button

until the LCD lights up. All the used

segments will be visible for one second

(or as long as the button is pressed).

Freeze the display

• While in measurement mode, press the

SET/HOLD button. The reading will be

frozen on the LCD. Press any button to

return to normal mode.

Turn the meter off

• While in measurement mode, press the

ON/OFF/MODE button. OFF will appear

on the secondary display. Release the

button.

Note: If measurements are taken in different

sam pl es successiv ely, rinse the

probe thorough l y to eliminate

cross-contamination. After cleaning,

rinse the probe with some of the

sample to be measured.

OPERATIONAL GUIDE

pH MEASUREMENT &

CALIBRATION

Taking Measurement

• Submerge the electrode in the solution to

be tested while stirring it gently.

• Measurements should be taken when the

stability indicator (hourglass) disappears.

• The pH value automatically compensated

for temperature is shown on the primary

LCD level while the secondary one shows

the sample temperature.

Note: Before taking any pH measurement,

make sure the meter has been calibrated

(CAL tag is displayed).

pH Calibration

For better accuracy, frequent calibration of

the instrument is recommended. In addition,

the instrument must be recalibrated whenever:

a) The pH electrode is replaced.

b) After testing aggressive chemicals.

c) Where high accuracy is required.

d) At least once a month.

Note: When the calibration procedure is

completed, the CAL tag is turned on.

To quit calibration & reset to default values

• After entering the calibration mode and

before the first point is accepted, you can

quit the procedure and return to the last

calibration data by pressing the ON/OFF/

MODE button. The secondary LCD displays

“ESC”for one second and then the meter

returns to the normal measuring mode.

• To reset to the default calibration values, press

SET/HOLD after entering the calibration

mode and before the first point is accepted.

The secondary LCD displays “CLR” for

one second, the meter resets to the default

calibration and the CAL tag disappears.

Calibration Procedure

• From normal measuring mode, press and

hold the ON/OFF/MODE button until OFF

on the secondary LCD is replaced by CAL.

• Release the button. The LCD enters the

calibration mode displaying “pH 7.01

USE” (or “pH 6.86 USE” if the NIST buffer

set was selected).

• The meter automatically recognizes buffers:

if a valid buffer is detected then its value

is shown on the primary display and REC

appears on the secondary LCD level. If no

valid buffer is detected, the meter keeps

the USE indication active for 12 seconds,

followed by WRNG, indicating the buffer

being measured is not a valid calibration value.

Single-Point Calibration

• For a single-point calibration with buffers

pH 4.01, 9.18 or 10.01, the meter automatically

accepts the calibration when the reading

is stable. The accepted buffer is displayed

together with the message “OK 1” for one

second, then the meter automatically returns

to the normal measuring mode.

• If a single-point calibration with buffer pH

7.01 (or pH 6.86) is desired, then after the

calibration point has been accepted, press

the ON/OFF/MODE button to return to

normal mode. The meter shows “7.01”

(or“6.86”) and “OK 1” for one second, then

it automatically returns to the normal mode.

Note: For better accuracy, it is recommended

to perform a 2-point calibration.

Two-Point Calibration

• For a two-point calibration, place the electrode

in pH 7.01 (or pH 6.86) buffer. After the

first calibration point has been accepted,

the “pH 4.01 USE” message appears. The

message is held for 12 seconds, unless a

valid buffer is recognized. If no valid buffer

is recognized, then the WRNG message is

shown. If a valid buffer (pH 4.01, 10.01, or

SETUP

Setup mode allows the selection of temperature

unit and pH buffer set.

To enter the setup mode, press the ON/OFF/

MODE button until CAL on the secondary

display is replaced by TEMP and the current

temperature unit (e.g. TEMP °C). Then:

For °C/°F selection:

• Use the SET/HOLD button. After the

temperature unit has been selected, press

the ON/OFF/MODE button to enter the

buffer set selection mode.

• Press the ON/OFF/MODE button again to

return to the normal measuring mode.

To change the calibration buffer set:

• After setting the temperature unit, the meter

will show the current buffer set: “pH 7.01

BUFF” (for 4.01/7.01/10.01) or “pH 6.86

BUFF” (for NIST 4.01/6.86/*9.18).

• Change the set with the SET/HOLD button,

then press ON/OFF/MODE to return to the

normal measurement mode.

ELECTRODE MAINTENANCE

When not in use, rinse the electrode with

water and store it with a few drops of

AD70300 storage solution in the protective

cap.

NEVER STORE THE ELECTRODE IN

DISTILLED OR DEIONIZED WATER!

• If the electrode has been left dry, soak the

tip in storage solution for at least one hour

to reactivate it.

• To prolong the electrode life, it is recommended

to clean it monthly by immersing the tip

in AD7061 general cleaning solution for

30 minutes. Afterwards, rinse it thoroughly

with tap water and recalibrate the meter.

• The electrode can be easily replaced by

unscrewing the body as shown below.

When the batteries become weak, the battery

symbol on the LCD lights up to indicate a

low battery condition. Batteries should be

replaced soon.

To change the batteries, unscrew and release

the electrode body.

Take out the battery

compartment and

carefully replace all

four batteries while

paying attention to

their polarity.

Reattach and tighten

the electrode body

properly to ensure a

watertight seal.

BATTERY REPLACEMENT

9.18) is detected, then the meter completes

the calibration procedure. The LCD shows

the accepted value with the “OK 2” message,

and then the meter returns to the normal mode.

Produkt Specifikationer

Mærke:	Adwa
Kategori:	Måling
Model:	AD12

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